If you are looking for a ready-to-use "Battery Monitor" app, you can find them on official and reputable third-party platforms:
Apps like Battery Monitor by Glgjing or Cross-Device Battery Monitor are available on the Google Play Store for direct installation. Download Battery Monitor build apk
What app do you download to monitor the battery information? If you are looking for a ready-to-use "Battery
For developers or users wanting a custom "Battery Monitor" build, you can compile open-source projects using or Docker : I can give you more exact build instructions
You can often find native battery info by dialing *#*#4636#*#* in your phone's dialer to access the "Testing" menu.
Some hardware-specific monitors (like smart battery shunts) provide APKs directly via their official websites or representative emails. 2. Build Your Own APK from Source
Could you specify if you are looking for a (like Victron or a smart shunt) or a particular open-source project ? I can give you more exact build instructions if I know the project name.